Plantar warts are effectively treated with cryotherapy, which is usually not easy to cure completely, and requires several freezes to make the warts come off completely. Plantar warts are benign proliferative lesions caused by human papillomavirus infection that occur on the feet, and cryotherapy is the conventional treatment for this disease. The warts are destroyed by the low temperature of liquid nitrogen, so that the warts will fall off naturally. The warts can be removed in about 2 weeks after freezing, but because the warts can not be completely destroyed at one time, it is often necessary to carry out a number of freezing. The treatment of plantar warts includes medication, laser treatment and surgery, which should be chosen according to the specific condition. The warts should not be scratched during the course of the disease, to prevent their own inoculation of new warts. At the same time, we should keep the lesions clean to prevent secondary infection.